y2pr x2pr21 w2pr2 v2pr u2pr21

9bpr21 8bpr2 7bpr 6bpr21 5bpr2

klor2 jlor ilor21 hlor2 glor

vunr uunr21 tunr2 sunr runr21

63mr21 53mr2 43mr 33mr21 23mr2